That's why average/normal-sized penises (6-inches give or take an inch or so) have been evolutionarily selected by women over the millennia. That size describes 95% of all penises. While the porn industry pushes big cocks, most amateur porn features normal-sized cocks. Most women prefer 6-inches but enjoy thickness. They like to be full, not have their cervix bruised. Also, most 6-inch cocks can be deep-throated by an eager slut who's practiced, whereas 10-inch cocks almost never get engulfed. This benefit for both men and women, allows normal-sized men to enjoy a nice deep-throating, while women enjoy having their mouths full. If women really preferred huge cocks they would have been selected as the norm. MM seems able to accept his thickness.
And she does it even when your girth makes her mouth tired quickly. Every guy wants to have a big cock until you meet women who complain about your girth, how tired they get sucking you, etc. This woman keeps the struggle quiet and takes the discomfort to please her man.
How do you tell if a slut is in love with a cock? It looks like this. It's wonderful to watch a mature woman make love to a cock with such affection and enthusiasm. Just watching her suck shows clearly what need she still has. It's such a pleasure to share your cock with a mature woman. She's literally trying to drain the sperm from him.